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Recycling of Yttrium and Europium from Microwave-Roasted Waste Cathode Ray Tube Phosphor Powder

  • Recent Developments on Metals and Energy Extraction from Waste Streams
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Abstract

Waste cathode ray tubes (CRT) containing a high quantity of yttrium and europium have great potential for the resource circulation of rare earths through an efficient recycling process. This study examined how the removal of zinc from a CRT that had been microwave-roasted at various temperatures (600–800°C) affected the various mineral phases of rare earths. The parameters like acid medium, concentration, temperature, and time were varied to yield about 99% leaching efficiency using 2.0 mol/L HCl at 5% pulp density for 60 min of leaching performed at 90°C. The apparent activation energy values (Ea(Y), 22.1 kJ/mol, and Ea(Eu), 16.7 kJ/mol) show that the leaching follows an intermediate-controlled mechanism by following the logarithmic rate law. Finally, the mixed oxalate precipitation at the stoichiometric ratio of REE3+:C2O42– = 1:1.5 gave high-purity (Y,Eu)2(C2O4)3 salt.

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Acknowledgements

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (project no. 2023-00243477) and a grant funded by the Korea Government (MSIT) (no. 2022R1A5A1032539).

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Authors and Affiliations

  1. Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang, 550000, Vietnam

    Rajiv Ranjan Srivastava

  2. Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Vietnam

    Rajiv Ranjan Srivastava

  3. Department of Earth Resources and Environmental Engineering, Hanyang University, Seongdong-gu, Seoul, 04763, Republic of Korea

    Sadia Ilyas, Ji-hye Yang & Hyunjung Kim

  4. Department of Chemical Science and Engineering, Kathmandu University, Dhulikhel, 45200, Nepal

    Dilip Kumar Rajak

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  1. Rajiv Ranjan Srivastava
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Correspondence to Rajiv Ranjan Srivastava, Sadia Ilyas or Hyunjung Kim.

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Srivastava, R.R., Ilyas, S., Rajak, D.K. et al. Recycling of Yttrium and Europium from Microwave-Roasted Waste Cathode Ray Tube Phosphor Powder. JOM 76, 1429–1436 (2024). https://doi.org/10.1007/s11837-023-06252-0

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